it's injected in ModuleHost.vb (DNN Source version)

Here's the code:
Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)
            MyBase.OnPreRender(e)

            Dim strModuleName As String = Me.ModuleControl.ModuleContext.Configuration.DesktopModule.ModuleName
            If Not strModuleName = Nothing Then
                strModuleName = strModuleName.Replace(".", "_")
            End If
            Me.Attributes.Add("class", strModuleName + "Content")
        End Sub

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See above comments especially from Timo...

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Ken Grierson
DotNetNuke Corporation
Test Lead

Thanks for the information Charles.

I can see it is a feature that is being improved over time. My current ticket at Gemini suggests adding an on-off switch for it. I hope it's a positive suggestion.

I support the idea of adding features like this to the core. Timo's full of good ideas and the ability to inject classes is well-intentioned, but fraught with issues. If I had taken the final leap to DNN5 earlier, I would certainly have brought this up earlier as well.

It also opens a wider discussion: Whether the core should add new features like this as permanent, or as optional functionality. I'm highly in favour of creating features as options.  It avoids immediate problems, such as I'm facing now, and it creates a more flexible framework at the same time.

I'll just add that to the ticket so it might be considered.
Regards
Rob